Figure 15.

SERS signal as a function of the distance from the surface. A short and a long-range component are identified; they are associated to morphological features of the metallic substrate with a size of approximately 1 nm and 20 nm, respectively. In the insets, a scanning electron microscopy (SEM) picture of the SERS substrate (silver film over nanospheres) and a simulation of the electric field are presented. Reproduced with permission from Masango et al. [236]. Copyright (2016), American Chemical Society.